There is no decent way to get the original values of WebIDL constants

[bzbarsky]

getOriginalProperty doesn't allow a target that is a WebIDL prototype or constructor. So to use it to get a constant you have to get an instance of that interface and that as target.

None of the other APIs being introduced here return WebIDL constants.

[domenic]

Yeah, this is intentionally noted as not a supported capability:

// Non-method statics: use the actual constant values instead

Do you think we should make this clearer? Or, do you think this capability is important and we should make it possible somehow?

[bzbarsky]

It's only important in the sense of making it simpler to write code using these primitives.

That said, I guess if you want to do Node.DOCUMENT_NODE you can get the original Node constructor and then just get its .DOCUMENT_NODE. It's non-configurable and non-writable so this is safe... as long as you know for sure it's there at all.